Housing trends remained weak through the middle of spring , with Cotality’s national Home Value Index (HVI) down 1.2% in October, taking the downturn into... The speed of decline is tracking faster than any previous downturn over the past 40 years, with capital city values down 8.1% in seven months. Brisbane (-2.0%) and Perth (-1.7%) values are falling at a faster rate than Sydney (-1.6%).